Peer relations in childhood.
D000339:Affect; D000374:Aggression / Q000523:psychology; D002648:Child; D003142:Communication; D003220:Conflict, Psychological; D003299:Cooperative Behavior; D033062:Friends; D005868:Gestures; D006801:Humans; D007398:Interpersonal Relations; D010379:Peer Group; D012919:Social Behavior